GB/T 19071.1-2018Wind turbines—Asynchronous generator—Part 1: Technical conditions (English PDF)

Foreword

GB/T 19071, Wind turbines - Asynchronous generator, comprises two parts.

-- Part 1. Technical conditions;

-- Part 2. Test method.

This Part is Part 1 of GB/T 19071.

This Part was drafted in accordance with the rules given in GB/T 1.1-2009.

This Part replaces GB/T 19071.1-2003, Wind turbines - Asynchronous generator - Part 1. Technical conditions. Compared with GB/T 19071.1-2003, the major changes of this Part are as follows.

-- it changes the applicable scope of the standard (see Clause 1);

-- it adds the normative references GB/T 1971, GB/T 1032, GB/T 10069.3 and GB/T 20626.1 (see Clause 2);

-- it adds the rated power specifications of single-speed generators. 50 kW, 100 kW, 800 kW, 1,100 kW, 2,000 kW, 2,500 kW and 3,000 kW (in case of any special requirement, it can be as agreed on by user and manufacturer) (see 3.5);

-- it deletes the rated voltages of single-speed generators "400 V, 1,000 V and 1,500 V" (see 3.6);

-- it deletes the specifications of two-speed generators' rated power "660 kW/180 kW and 750 kW/220 kW"; it adds the specifications "660 kW/150 kW, 750 kW/200 kW, 1,300 kW/250 kW" (see 3.7);

-- it adds the synchronous rotational speed of two-speed generators 1,000 r/min/ 750 r/min (see 3.8);

-- it deletes the speed differences of single-speed and two-speed generators (see 3.9 of 2003 edition);

-- it adds the diameter specifications and deviations of shaft extension without a keyway (see Table 1 of 3.9);

-- it changes the tolerances for circle run-out of shaft extension (see 3.10; 3.10.3 of 2003 edition);

1 Scope

This Part of GB/T 19071 specifies the main types, basic parameters and dimensions, technical requirements, test method, inspection rules, test items, and marking, packaging, transportation and other requirements for asynchronous generators for grid-connected, constant-speed wind turbines.

This Part applies to grid-connected, constant-speed single-speed or two-speed asynchronous generators (hereinafter referred to as "generators"); it can be referred to for other types of generators.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced documents (including all amendments) applies to this document.

GB/T 191, Packaging - Pictorial marking for handling of goods

GB/T 755, Rotating electrical machines - Rating and performance

GB/T 997-2008, Rotating electrical machines - Classification of types of construction, mounting arrangements and terminal box position (IM code)

GB/T 1032, Test procedures for three-phase induction motors

GB/T 1971, Rotating electrical machines - Terminal markings and direction of rotation

GB/T 4942.1-2006, Degrees of protection provided by the integral design of rotating electrical machined (IP code) - Classification

GB/T 10068-2008, Mechanical vibration of certain machines with shaft heights 56 mm and higher - measurement, evaluation and limits of vibration severity

GB/T 10069.1, Measurement of airborne noise emitted by rotating electrical machines and the noise limits - Part 1. Method for the measurement of airborne noise emitted by rotating electrical machines

GB/T 10069.3, Measurement of airborne noise emitted by rotating electrical machines and the noise limits - Part 3. Noise limits

GB/T 12665, Requirements of damp-heat testing of electrical machine for service in general environmental condition

GB/T 19071.2, Asynchronous generator for wind turbine generator systems - Part 2. Test method

GB/T 22714, Test specifications for interturn insulation of form-wound winding for AC low-voltage electrical machines

GB/T 22719.1, Interturn insulation of random-wound winding for AC low-voltage electrical machines - Part 1. Test methods

GB/T 22719.2, Interturn insulation of random-wound winding for AC low-voltage electrical machines - Part 2. Test limits

3 Types, basic parameters and dimensions

3.1 The enclosure protection degree of generators shall not be lower than the specification of IP 44 of GB/T 4942.1-2006.

3.2 Generators shall have a reliable cooling method. In case of a forced-air cooling method, it shall be ensured that the air introduced will cause no damage to generators; in case of a water cooling method, there shall be no water seepage or water leakage.

3.3 The structure and installation type of generators shall meet the specification of IM B3 of GB/T 997-2008.

3.4 The rating of generators is a continuous rating based on the continuous duty system (S1).

3.5 It is recommended that single-speed generators are made according to the following rated powers.

50 kW, 100 kW, 150 kW, 200 kW, 250 kW, 300 kW, 400 kW, 500 kW, 600 kW, 660 kW, 750 kW, 800 kW, 1,000 kW, 1,100 kW, 1,320 kW, 1,500 kW, 2,000 kW, 2,500 kW, 3,000 kW (in case of any special requirement, it can be as agreed on by user and manufacturer).

3.6 The rated frequency of single-speed generators is 50 Hz; the synchronous rotational speed is 1,500 r/min; the rated voltage is 690 V (in case of any special […]

4 Technical requirements

4.7 After rated heat test, maintain the rated voltage unchanged and generators shall be capable of bearing 1.15 times of rated load for 1 h. Then the temperature rise is not assessed, but generators shall not have damages or harmful deformation.

4.8 Generators shall be capable of bearing 1.2 times of maximum operating rotational speed (in case of any special requirement, it can be as agreed on by user and manufacturer), without any harmful deformation within 2 min.

4.9 After heat condition or heat test, the insulation resistance of generators' stator windings shall not be lower than UN/1,000 Mohm. When measuring resistance, the selection of tramegger shall be as specified in GB/T 1032.

NOTE: UN - rated voltage, in V.

4.10 Generators' stator windings shall be capable of bearing withstand voltage test for 1 min between all phases and duplex windings, without breakdown. The frequency of test voltage is 50 Hz, which is of sinusoidal wave if possible. The effective value of voltage is (2UN + 1,000) V, but not lower than 1,500 V.

This test shall not be repeated on the same generator. If required by user, it is allowed to conduct one more test on site before commissioning after installation. The test voltage shall be as specified in GB/T 755.

4.11 Generators' stator windings shall be capable of bearing inter-turn withstand voltage test without breakdown. When generators are equipped with random windings, their test impact voltage peak and test method shall be as specified in GB/T 22719.1 and GB/T 22719.2. When generators are equipped with formed windings, their test impact voltage peak and test method shall be as specified in GB/T 22714.

4.12 Short-time voltage rising test shall be conducted for generators. Use the no-load generator method for the test; apply a voltage 130% of the rated voltage; the test duration is 3 min. The inter-turn insulation shall have no damage. When improving the voltage value to 130% of the rated voltage, it is allowed to improve the frequency or rotational speed at the same time, but the rotational speed shall not exceed 115% of the rated value.

4.13 After test is conducted for 6 cycles for generators' stator windings using the 40°C alternate damp-heat test method specified in GB/T 12665, the insulation resistance shall not be lower than the value specified in 4.9 and they shall be capable of bearing the withstand voltage test specified in 4.10 without breakdown. (Only applicable to the generators for which user has such a requirement, this requirement shall be stated in the contract.)

7 Marking, packaging, transportation and storage